The effects of population density and food surface area on body weight of Acheta domesticus (L.) (Orthoptera: Gryllidae)

1977 ◽  
Vol 55 (12) ◽  
pp. 2004-2010 ◽  
Author(s):  
Patricia S. Tennis ◽  
Joseph F. Koonce ◽  
Mitsuo Teraguchi
Keyword(s):  
Body Weight ◽  
Population Density ◽  
Emerging Adults ◽  
Surface Area ◽  
Development Time ◽  
Acheta Domesticus ◽  
Initial Population ◽  
Nymphal Development ◽  
Mean Size ◽  
The Mean

Experiments were performed to determine the effects of population density and food surface area on individual size (wet weight) of the house cricket, Acheta domesticus (L.). Three initial population densities (50, 200, and 400 hoppers per microcosm) were used to study the effects of population density, three food surface areas (one, two, and three petri dishes, 9.0 cm in diameter) were used to assess the effects of food surface area, and each treatment was replicated with three populations. Mortality increased and individual weight (at 53 days) decreased with increasing density. Both percentage survivorship and mean body weight increased with increasing food surface area. In both sets of experiments the mean size of emerging adults (0–24 h) decreased with increasing nymphal development time, and nymphal development time increased with increasing density and decreasing food surface area. On a daily comparison the mean size of emerging adults of both sexes decreased with increasing density, and the mean size of females increased with decreasing food surface area.

O2 diffusion in lung of the anesthetized cat

1959 ◽  
Vol 14 (6) ◽  
pp. 917-922 ◽  
Author(s):  
Helen N. Duke ◽  
R. D. Stedeford
Keyword(s):  
Body Weight ◽  
Surface Area ◽  
Body Surface ◽  
Intravenous Infusion ◽  
Diffusing Capacity ◽  
Experimental Conditions ◽  
O2 Diffusion ◽  
The Mean ◽  
Dissociation Curves ◽  
Anesthetized Cat

In cats under chloralose anesthesia, the mean diffusing capacity for O2 (Do2) was 0.91 (S.D. ± 0.29). The mean Do2/m2 body surface was 3.26 (S.D. ± 1.30). Under the experimental conditions described, the Do2 was linearly related to the O2 consumption/body weight or surface area of the animal. The Do2 was reduced by bronchial occlusion in approximate proportion to the blocked area. Cooling the animal also reduced the Do2. Epinephrine and 5-hydroxytryptamine given by constant intravenous infusion had slight effects on the Do2. Dissociation curves for cats' blood are reported. Submitted on December 5, 1958

Allometry of the mammalian intracellular pulmonary surfactant system

2010 ◽  
Vol 109 (6) ◽  
pp. 1662-1669 ◽  
Author(s):  
André Wirkes ◽  
Kristina Jung ◽  
Matthias Ochs ◽  
Christian Mühlfeld
Keyword(s):  
Surface Area ◽  
Pulmonary Surfactant ◽  
Human Lung ◽  
Mammalian Species ◽  
Weighted Mean ◽  
Electron Microscopic ◽  
Alveolar Epithelial ◽  
Interspecific Variations ◽  
Mean Size ◽  
The Mean

Alveolar epithelial (AE) surface area is closely correlated with body mass (BM) in mammals. The AE is covered by a surfactant layer produced by alveolar epithelial type II (AE2) cells. We hypothesized that the total number of AE2 cells and the volume of intracellular surfactant-storing lamellar bodies (Lb) are correlated with BM with a similar slope as AE surface area. We used light and electron microscopic stereology to estimate the number and mean volume of AE2 cells and the total volume of Lb in 12 mammalian species ranging from 2 to 3 g (Etruscan shrew) to 400–500 kg (horse) BM. The mean size of Lb was evaluated using the volume-weighted mean volume and the volume-to-surface ratio of Lb. The mean volume of AE2 cells was 500–600 μm3 in most species, but was higher in Etruscan shrew, guinea pig, and human lung. The mean volume of Lb per AE2 cell was 80–100 μm3 in most species, with the same exceptions as above. However, the total number of AE2 cells and the total volume of Lb were closely correlated with BM and exhibited an allometric relationship similar to the slope of AE surface area. The mean size of Lb was similar in all investigated species. In conclusion, the mean volume of AE2 cells and their Lb are independent of BM but show some interspecific variations. The adaptation of the intracellular surfactant pool size to BM is obtained by the variation of the number of AE2 cells in the lung.

scholarly journals Oxygen Consumption and Cell Size. A Comparison of the Rate of Oxygen Consumption of Diploid and Triploid Prepupae of Drosophila Melanogaster Meigen

1953 ◽  
Vol 30 (4) ◽  
pp. 475-491 ◽  
Author(s):  
C. ELLENBY
Keyword(s):  
Body Weight ◽  
Drosophila Melanogaster ◽  
Oxygen Consumption ◽  
Body Size ◽  
Surface Area ◽  
Cell Size ◽  
Rate Of Oxygen Consumption ◽  
The Mean ◽  
Relationship Of ◽  
The Relationship

1. The oxygen consumption and surface area of individual diploid and triploid prepupae of Drosophila melanogaster have been measured, the cells of triploid animals being larger. 2. The mean weights for the types examined are different but their ranges overlap almost completely. By covariance analysis it is shown that, after adjustment for difference in body size, there are no differences in the rates of oxygen consumption. It is concluded that, for these animals, cell size has no influence on the rate of oxygen consumption. 3. The relationships between body weight, surface area, and oxygen consumption have been further investigated. It is shown that, despite the greater inaccuracy of the method by which surface area is determined, oxygen consumption can be predicted more accurately from surface area than from body weight. 4. The results are discussed in relation to an earlier investigation of the oxygen consumption of other genotypes (Ellenby, 1945 a, b). Possible technical causes of certain differences between the two series of results in the relationship of oxygen consumption and body weight are explored; it is concluded, however, that they are almost certainly due to differences, not necessarily genetical, between the animals used in the two series.

Optimization of the multichamber crystallizer

1979 ◽  
Vol 44 (4) ◽  
pp. 1239-1245 ◽  
Author(s):  
Jaroslav Nývlt ◽  
Luděk Provazník
Keyword(s):  
Mathematical Model ◽  
Surface Area ◽  
Temperature Difference ◽  
Large Temperature ◽  
Optimization Criteria ◽  
Temperature Distributions ◽  
Crystallization Surface ◽  
Mean Size ◽  
The Mean ◽  
Glauber Salt

Mathematical model of the multichamber crystallizer is proposed and is solved for various combinations of temperature distributions among individual chambers. Results of a series of calculations have demonstrated that the most important factors are the temperatures in the first two chambers of the crystallizer while sufficient crystallization surface area in other chambers suffices for reduction of supersaturation even at a large temperature difference. Optimization of the five-chamber crystallizer with the mean size of product crystals chosen as the optimization criteria is then performed for constants corresponding to crystallization of Glauber salt.

Oxygen Consumption of Prepupae of Drosophila Melanogaster Meigen, in Relation to the Surface Area of the Puparium

1945 ◽  
Vol 21 (1-2) ◽  
pp. 39-45
Author(s):  
C. ELLENBY
Keyword(s):  
Body Weight ◽  
Drosophila Melanogaster ◽  
Oxygen Consumption ◽  
Surface Area ◽  
Body Surface ◽  
Standard Error ◽  
Significant Variation ◽  
Wet Weight ◽  
The Mean ◽  
The Relationship

1. A method is described by means of which the surface area of puparia of Drosophila melanogaster may be measured. 2. Measurement of almost 200 puparia showed that the relationship between surface area, per mg., and body weight could best be expressed in the form of the equation S=7.7049-2.1099X, where S=surface area, sq. mm. per mg. wet weight, for prepupae of mean wet weight X mg. As the standard error of estimate, ±0.117, is equal to only 2.2% of the mean surface area per mg., the surface area can be accurately estimated from the wet weight. 3. The prepupal oxygen consumption, per mg. wet weight, is shown to decrease steadily with increasing body weight; with an increase in mean wet weight from 0.847 to 1.700 mg., the oxygen consumption, per mg., decreases by about 50%. 4. Utilizing the above regression equation, the surface area of prepupae of known oxygen consumption was estimated and thus the oxygen consumption per sq. mm. of body surface. These values show no significant variation with increasing body weight, so that it can be concluded that the oxygen consumption of prepupae of D. melanogaster is proportional to the surface area.

Effect of High Plane of Nutrition on Blood Biochemical Profile and Onset of Puberty in Prepubertal HF X Kankrej Crossbred Heifers

2019 ◽  
Vol 15 (02) ◽  
pp. 14-17
Author(s):  
K K Hadiya ◽  
A J Dhami ◽  
D V Chaudhari ◽  
P M Lunagariya
Keyword(s):  
Body Weight ◽  
Treatment Group ◽  
Plasma Levels ◽  
Age Of Onset ◽  
The Body ◽  
Monthly Interval ◽  
Control Group ◽  
Blood Biochemical ◽  
Lower Protein ◽  
The Mean

This study was initiated on 24 prepubertal Holstein x Kankrej crossbred heifers of nearly identical age (7-9 months) and body weight (130-140 kg) at University farm to evaluate the effect of high plane of nutrition on blood biochemical and minerals profile and the age at puberty. Twelve heifers were managed under routine farm feeding (control) and the rest 12 under ideal optimum feeding regime (treatment) that included extra 1 kg concentrate, 30 g min mix and ad-lib dry fodder. The body weight and ovarian ultrasonography together with blood sampling was carried out at monthly interval from 10 to 18 months of age to study the ovarian dynamics and blood biochemical changes. High plane of nutrition to growing heifers was beneficial in reducing the age of onset of puberty (by 2-3 months) compared to routine farm fed group. The mean plasma total protein and cholesterol concentrations showed a rising trend with significant variations from 10 to 16 months of age, where it got mostly stabilized indicating adult profile. The activity of enzymes GOT and GPT also rose gradually and significantly from 10 months till 14-15 months of age, and thereafter it remained more or less static till 18 months of age. The levels of both these enzymes were higher, with lower protein and cholesterol, in control than the treatment group from 15-16 months of age onwards. The mean plasma levels of both calcium and phosphorus increased gradually and significantly with advancing age till 16-17 months of age, with little higher values in supplemented than a control group. The plasma levels of zinc, iron, copper, and cobalt also showed rising trend with significant differences between 10th and 12th-14th months of age, and from 15th to 18th months of age the levels were statistically the same in all the groups with slightly higher values in the treatment group.

Batch Precipitation of Lead Iodide

1994 ◽  
Vol 59 (6) ◽  
pp. 1301-1304
Author(s):  
Jaroslav Nývlt ◽  
Stanislav Žáček
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Crystal Size ◽  
Lead Nitrate ◽  
Lead Iodide ◽  
Constant Rate ◽  
Mean Size ◽  
The Mean

Lead iodide was precipitated by a procedure in which an aqueous solution of potassium iodide at a concentration of 0.03, 0.10 or 0.20 mol l-1 was stirred while an aqueous solution of lead nitrate at one-half concentration was added at a constant rate. The mean size of the PbI2 crystals was determined by evaluating the particle size distribution, which was measured sedimentometrically. The dependence of the mean crystal size on the duration of the experiment exhibited a minimum for any of the concentrations applied. The reason for this is discussed.

scholarly journals Effects of topical gel formulation of Ficus carica latex on cutaneous leishmaniasis induced by Leishmania major in BALB/c mice

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Ali Pouryousef ◽  
Erfan Eslami ◽  
Sepehr Shahriarirad ◽  
Sina Zoghi ◽  
Mehdi Emami ◽  
...  
Keyword(s):  
Cutaneous Leishmaniasis ◽  
Murine Model ◽  
Leishmania Major ◽  
Considerable Effect ◽  
Ficus Carica ◽  
Control Group ◽  
Topical Gel ◽  
The Third ◽  
Mean Size ◽  
The Mean

Abstract Objectives The current study aimed to evaluate the effects of Ficus carica latex on the treatment of cutaneous leishmaniasis (CL), induced by Leishmania major. A 5% topical gel with F. carica latex was prepared. BALB/c mice were infected by inoculation of amastigotes form of L. major. Thirty BALB/c mice were divided into five groups, where the first group was treated daily, the second group twice per day, and the third group every other day with the 5% topical gel, for 3 weeks. The sizes of the lesions were measured before and during the course of treatment. Results Although the mean size of lesions in the mice group treated with the 5% F. carica gel, especially in the group receiving daily treatment, was less than the mean size of the lesions in the control group, yet, the differences was not statistically significant (p > 0.05). The findings of the current study demonstrated that the 5% F. carica latex with a 3-week course of treatment had no considerable effect in recovery or control of CL induced by L. major in the murine model. Using higher concentration of F. carica latex and with longer treatment lengths may increase its efficacy in the treatment of CL.

scholarly journals Mudrock Microstructure: A Technique for Distinguishing between Deep-Water Fine-Grained Sediments

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 653
Author(s):  
Shereef Bankole ◽  
Dorrik Stow ◽  
Zeinab Smillie ◽  
Jim Buckman ◽  
Helen Lever
Keyword(s):  
Grain Size ◽  
Deep Water ◽  
Sedimentary Facies ◽  
X Ray Diffraction ◽  
Weak Current ◽  
Large Area ◽  
Fine Grained ◽  
Mean Size ◽  
The Mean ◽  
Water Facies

Distinguishing among deep-water sedimentary facies has been a difficult task. This is possibly due to the process continuum in deep water, in which sediments occur in complex associations. The lack of definite sedimentological features among the different facies between hemipelagites and contourites presented a great challenge. In this study, we present detailed mudrock characteristics of the three main deep-water facies based on sedimentological characteristics, laser diffraction granulometry, high-resolution, large area scanning electron microscopy (SEM), and the synchrotron X-ray diffraction technique. Our results show that the deep-water microstructure is mainly process controlled, and that the controlling factor on their grain size is much more complex than previously envisaged. Retarding current velocity, as well as the lower carrying capacity of the current, has an impact on the mean size and sorting for the contourite and turbidite facies, whereas hemipelagite grain size is impacted by the natural heterogeneity of the system caused by bioturbation. Based on the microfabric analysis, there is a disparate pattern observed among the sedimentary facies; turbidites are generally bedding parallel due to strong currents resulting in shear flow, contourites are random to semi-random as they are impacted by a weak current, while hemipelagites are random to oblique since they are impacted by bioturbation.

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